public class AB {
    public static void mian(String[] args){
        yuan s=new yuan();
        s.yuan(9,9);

    }
}
class yuan{
    int r,l;
    public int yuan(int r,int l){
     return(r*l);
    }
    public double yuan(int r){
        return(r*r*3.14);
    }
}